<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>留言板</title>
        <link rel="stylesheet" href="css/lyb.css">
        
       </head>
<body>
    <div>
        <iframe src="demo_nav.html" frameborder="no" border="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
    </div>
 <div class="messages">
 <h1>留言板</h1>
 <div class="form">
 <input type="text" id="username" placeholder="用户名">
 <textarea placeholder="留言内容" id="message"></textarea>
 <input type="button" value="留言" onClick="startRequest()">
	<br><br>
	<div id="target"></div>
	
	<script src="jquery-3.7.1.min.js"></script>
	<script>
		function startRequest(){
			$('#target').load("http://demo-api.geekfun.website/js-jquery/14-1.aspx");
		}
	</script>
 
 

 </div>
</div>
</div>
</div>
</body>
</html>